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| Section | Objectives |
|---|---|
| Topic 1: 5G RAN Systems and Fault Management | - Alarm and fault handling
|
| Topic 2: Network Operations in 5G RAN | - Remote operation of 5G Radio Access Network
|
>> NRN-522 Certification Test Answers <<
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NEW QUESTION # 44
What is the AISG bus used for in the context of antenna line device management?
Answer: A
Explanation:
The Antenna Interface Standards Group (AISG) bus is a standardized communication interface (typically layered over RS-485 and sometimes carried over the same coaxial feeder cable as the RF signal, using a technique that separates the control signal from the RF) that enables the base station's control unit to discover, communicate with, and control Antenna Line Devices (ALDs) mounted on or near the antenna - most commonly Remote Electrical Tilt (RET) actuators and Tower Mounted Amplifiers (TMAs). Through the AISG bus, the system can remotely query device status, read sensor data such as current tilt position, and send control commands such as tilt adjustments or TMA gain settings. This is entirely distinct from the CPRI
/eCPRI fiber links carrying baseband-to-RF digital radio signals, the O and M IP network connecting the site to centralized management systems like NetAct, or the DC power distribution supplying equipment - each of which serves a different, non-overlapping function within the site's overall infrastructure.
NEW QUESTION # 45
When planning the channel bandwidth and subcarrier spacing for a 5G cell, what is the primary operational impact of these parameters?
Answer: C
Explanation:
Channel bandwidth and subcarrier spacing are fundamental radio configuration parameters that together determine how many Physical Resource Blocks (PRBs) are available within a cell's carrier. Since PRBs are the basic units of radio resource that the scheduler allocates to UEs for both downlink and uplink transmissions, the number of available PRBs directly determines the cell's theoretical capacity - that is, how much traffic the cell can serve simultaneously before becoming congested. A wider channel bandwidth provides more PRBs and therefore greater capacity, while subcarrier spacing affects the size of each PRB in the frequency domain and has implications for latency and mobility performance at different frequency ranges. These parameters are foundational to capacity planning and must be configured consistently with the operator's spectrum holdings and regulatory allocations. They have no bearing on PLMN/TAC identifiers, alarm severity configuration, or O and M transport security, which are governed by entirely separate configuration domains.
NEW QUESTION # 46
A remote 5G site has redundant transport paths (primary and backup) providing OandM connectivity to NetAct. What is the main operational benefit of this redundancy?
Answer: C
Explanation:
Providing dual or redundant transport paths for O and M connectivity increases the resilience of remote management. If the primary backhaul link fails - for example, due to a fiber cut or a microwave link outage - the base station can continue to report alarms and performance data, and remain reachable for configuration changes via the secondary path, preserving the Operations Center's visibility and control without requiring a site visit purely to restore management connectivity. This redundancy specifically benefits the continuity of monitoring and management functions. It has no effect on a cell's radio coverage area, which depends on RF design parameters such as transmit power, antenna configuration, and frequency band, nor does it relate to spectrum-sharing arrangements between operators. It also does not eliminate the ongoing need for periodic software updates and patching, which remain a separate lifecycle management activity.
NEW QUESTION # 47
Which AirScale management tool allows an engineer to connect directly to a single base station for local-level configuration viewing and diagnostics, as opposed to network-wide centralized management?
Answer: C
Explanation:
The BTS Site Manager, also referred to as the local Element Manager, is the tool used to connect directly to an individual AirScale base station to view its local configuration, hardware inventory, logs, and run element- level diagnostics. It is typically used when an engineer needs granular, site-specific information that may not be fully visible through the centralized system, or when NetAct connectivity to the site is impaired. NetAct CM Editor is used for network-wide configuration management of many sites from the central OSS, NetAct PM Reports aggregates performance counters across the network, and the SON Network Optimizer automates parameter tuning across multiple cells. Because the question specifically asks about direct, single-element access for local diagnostics rather than network-wide operations, the BTS Site Manager is the correct answer, complementing NetAct in a complete remote operations toolkit.
NEW QUESTION # 48
Some alarms in NetAct FM clear automatically once the underlying fault condition no longer exists, while others require manual clearing by an engineer. What characterizes an alarm that requires manual clearing?
Answer: D
Explanation:
Many alarms in NetAct FM are designed to self-clear: once the network element detects that the underlying condition no longer exists - for example, a transient link flap recovering on its own - the element sends a clear notification and the alarm is automatically removed from the active list. However, some alarms represent conditions where the element cannot reliably self-verify resolution, such as certain hardware faults requiring physical intervention, or conditions tied to actions needing human confirmation. These alarms may remain active even after corrective action has been taken, until an engineer manually clears them or the system completes a subsequent successful self-test. NOC engineers need to understand this distinction so the active alarm list accurately reflects current network status, and so that manual clearing is correctly performed as part of completing a maintenance action where required.
NEW QUESTION # 49
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